Kawasaki 841337 1/2" 12-Volt Impact Wrench for $39.99 shipped.  Here is a screenshot for your reference. Alternatively, it is available at Northern Tool for $39.99 shipped. It features a 80-watt motor, 280-ft/lb max torque, 2500–5500 RPM no-load speed range, 2 double end sockets, and 11-ft power cord.  Most places have it for about $69.